Ryōtarō Okiayu (置鮎龍太郎, born in Kitakyushu on 17 November 1969) is a Japanese voice actor who provided voices in the Japanese version of Thomas & Friends.
He is best known for voicing Zero and Protoman from the "Mega Man" series, Alucard from the "Castlevania" series, Chocolateman from "Soreike! Anpanman", Rodimus Prime from "Transformers: Energon", Treize Khushrenda from "Mobile Suit Gundam Wing" and Scar from "Fullmetal Alchemist".
- Rheneas (fourth - seventh series)
- Troublesome Trucks (A Surprise for Percy)
- The Maithwaite stationmaster (fifth series only)
- A Signalman (Emily's New Coaches)
- Edward's driver (Edward's Brass Band)
- Percy's driver (Percy Gets it Right)
- Duck's driver (Edward the Very Useful Engine)
- Donald and Douglas' drivers (Bad Day at Castle Loch)
- Murdoch's driver (Peace and Quiet)
- Workmen (Busy Going Backwards)
- There Once was an Engine who Ran Away (performed as Fergus)